468 



GEOLOGICAL SURVEY OF THE TERRITORIES. 



HELICID^. 



Helix alternata, Say. 

 albolabris, Say. 

 albolabris, var.? 

 concava, Say. 

 costata, Midi, 

 cbersina, Say. 

 cooperi, W. G. B. 

 elevata, Say. 

 electrina, Gould, 

 fuliginosa, Binn. 

 fallax, Say. 

 baydeni, W. G. B. 

 birsuta, Say. 

 inflecta, Say. 

 indentata, Say. 

 ligera, Say. 

 lineata, Say. 

 ininuscula, Binn. 

 niinuta, Say. 

 monodon, Back, 

 multilineata, Say. 

 profunda, Say. 



LAND SHELLS. 



Helicedje— Continued. 



Helix solitaria, Say. 



striatella, Antb. 

 tbyroides, Say. 

 tridentata, Say. 



PUPAD^E. 



Pupa armifera, Say. 



badia, Adams. 



blandi, W. G. B. 



modesta, Say. 



pentodon, Say. 

 Zua subcylindracea, Obem. 



SUCCINTD^. 



Succinea avara, Say. 



baydeni, W. G. B. 

 lineata, W. G. B. 

 nuttalliana, ? Lea. 

 obliqua, Say. 

 vermeta, Say. 



VIVIPARED^E. 



Melantbo integra, Say. 



AjVLNICOLIP/iE. 



Amnicola porata, Say. 



cincinnatiensis, Antb. 

 Poniatiopsis lapidaria, Say*. 



Xymnea desidiosa, Say. 

 elodes, Say. 

 baydeni, Lea. 

 buinilis, Lea. 

 kirtlandiana, Lea. 

 palustris, Miill. 



FRESH-WATER SHELLS. 



Univalves. 



Lymnjead^e — Continued. 



Lyumea reflexa, Say. 

 umbrosa, Say. 



PHYSAD^. 



Pbysa beterostropba, Say. 

 Bulinus bypnoruni, Linn. 



planorbiile. 



Planorbis bicarinatus, Say. 

 trivolvis, Say, 

 companulatus, Say. 

 parvus, Say. 

 lentus, Say. 



